Probably a sequel rather than a spin-off

Firaxis and 2K Games have confirmed that a new Civilization game is now under development.

Turn based game for PC/Mac/iPad

Firaxis Games and publisher 2K have confirmed a new game called Sid Meier’s Starships. The title is already in development for a 2015 release on PC/Mac/iOS. The game itself is a turn based strategy games that set in the same universe as Civilization: Beyond Earth.

Firaxis making successor to Alpha Centauri

The title finally gets dated for release